The Maths of Spinning Coins and Euler's Disk

A spinning coin rotates as it wobbles. The rate of rotation is (1/cos(θ) - 1) of the rate of wobble. Draw an arrow on a coin and check it yourself!

The notes from the whiteboard are available here:
http://imgur.com/a/XVw6m

Here are the videos of the disk spinning:
NORMAL SPEED: https://youtu.be/dmo0whbDiGQ
10% SPEED: https://youtu.be/2Kk0KMQeRCk

Music by Howard Carter
Design by Simon Wright

MATT PARKER: Stand-up Mathematician
Website: http://standupmaths.com/
Maths book: http://makeanddo4D.com/
Nerdy maths toys: http://mathsgear.co.uk/

Видео The Maths of Spinning Coins and Euler's Disk канала Stand-up Maths